Crude niobium has been purified by a refining process consistiong of molten salt electrolysis and electron beam melting for materials of electron particle accelerator. The molten salt electronrefining was carried out galvanostatically using a FLINAK bath (26.3 mass% Lif-10.5 mass%NaF-47.0 mass%KF-16.2 mass%K_2NbF_7 at 963 K under Ar atmosphere. After the molten salt electronrefining and the electron beam melting, the contents of metallic impurity components in the purified niobium were determined by ICP emission spectrography analysis. Refractory metals such as tantalum, tungsten and molybdenum in crude niobium could be eliminated by means of molten salt electrorefining. Especially, the molten salt electrorefining method using fluoride bath was remarkably effective for the removal of merallic tantalum in crude niobium. Nonmetallic impurity components such as oxygen and nitrogen could be also remove by electron beam melting.Crude niobium of 99.8 mass% purity was found to be to 99.99 mass% by this process.